/Engine/Source/Runtime/GeometryCore/Public/Curve/CurveUtil.h
Construct a normal at a vertex of the Polygon by averaging the adjacent face normals. This vector is independent of the lengths of the adjacent segments. Points "inward" for a Clockwise Polygon, and outward for CounterClockwise Note: Specific to 2D curves; normals computed by rotating tangents in the XY plane
namespace UE { namespace Geometry { namespace CurveUtil { template<typename RealType, typename VectorType, bool bLoop> VectorType UE::Geometry::CurveUtil::GetNormal_FaceAvg2 ( const [TArrayView](API\Runtime\Core\Containers\TArrayView)< const VectorType > & Vertices, int VertexIndex ) } } }